As KY Jon said, a Mec jr with their " short kit " is the way to go. Any mild 2 3/4 load will do. If you roll crimp, a 2 1/2" shell needs the same length as a 2 3/4" star crimped shell. If you want to fold crimp with the Mec then a shorter plastic wad or fiber wads are in order to keep your load stack height far enough below the top. 2 1/2" roll crimped shells really look cool in old SxSs. And fiber wads blowing out the barrel add to the period correct atmosphere. Roll crimpers and fiber wads can be purchased from BPI or Precision Reloading [ my choice]. Good luck.